I hate to get involved in political discussion, but that seems inconsistent with the data: dropout rates for men in the US are slightly higher than for women, but the difference is only about three percentage points. Perhaps more saliently, the gap appears to historically have been larger for black and Hispanic students than for whites (it still is for Hispanics), which is exactly the opposite of what I'd expect if "nonstop denigration of whites, males, white males, and dead white males" was a major factor.

which has a lot to do with massive male drop out rate. That strikes me as both testable and improbable.